Method for coloring anodic oxide layer of aluminum alloy

An anodizing layer, anodizing technology, applied in the direction of anodizing, coating, surface reaction electrolytic coating, etc., can solve the problems of chemical coloring effect, poor adhesion of organic colorants, obvious color difference in different areas, etc. Achieve the effect of low production cost, stable coloring and simple process

Pending Publication Date: 2022-03-25
惠州市安泰普表面处理科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are technical problems in the existing chemical coloring methods applied to the coloring of anodized layers of aluminum alloys: the anodic oxidation process of aluminum alloys has an important influence on the microstructure of the anodized layers of aluminum alloys, and the anodized layers of aluminum alloys The mi...

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  • Method for coloring anodic oxide layer of aluminum alloy

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Embodiment 1

[0026] This embodiment provides a method for coloring the anodized layer of an aluminum alloy, comprising the following steps:

[0027] Step 1, polishing the surface of the aluminum alloy, thereby removing the original oxide layer on the surface of the aluminum alloy;

[0028] Step 2, degreasing the surface of the aluminum alloy;

[0029] Step 3, using a neutralizing solution to clean the surface of the aluminum alloy;

[0030] Step 4, place the aluminum alloy in the anodic oxidation solution for anodic oxidation to form an anodized layer, the anodic oxidation solution includes: 0.5g / L oxalic acid, 30g / L chromic anhydride, 0.5g / L boric acid, 0.5g / L Phosphoroacetic acid, 0.1g / L 3,4-dihydroxyphenylacetic acid, the temperature of anodic oxidation is 40°C, and the cathode current density of anodic oxidation is 0.5A / dm 2 , the anodizing voltage is 25V, and the anodizing time is 60min;

[0031] Step 5, use the coloring solution to color the anodized layer of the aluminum alloy. T...

Embodiment 2

[0034] This embodiment provides a method for coloring the anodized layer of an aluminum alloy, comprising the following steps:

[0035] Step 1, polishing the surface of the aluminum alloy, thereby removing the original oxide layer on the surface of the aluminum alloy;

[0036] Step 2, degreasing the surface of the aluminum alloy;

[0037] Step 3, using a neutralizing solution to clean the surface of the aluminum alloy;

[0038] Step 4, place the aluminum alloy in an anodic oxidation solution for anodic oxidation to form an anodic oxidation layer. The anodic oxidation solution includes: 2g / L oxalic acid, 80g / L chromic anhydride, 5g / L boric acid, 1g / L phosphoryl Acetic acid, 0.5g / L 3,4-dihydroxyphenylacetic acid, the temperature of anodic oxidation is 40-50℃, and the cathode current density of anodic oxidation is 1A / dm 2 , the anodizing voltage is 40V, and the anodizing time is 20min;

[0039] Step 5, use the coloring solution to color the anodized layer of the aluminum alloy...

Embodiment 3

[0042] This embodiment provides a method for coloring the anodized layer of an aluminum alloy. The aluminum alloy used in this embodiment is a 2024 aluminum alloy square with a specification of 15mm×15mm×10mm. The method includes the following steps:

[0043] Step 1, performing mechanical polishing on the surface of the aluminum alloy, thereby removing the original oxide layer on the surface of the aluminum alloy, and obtaining a clean and scratch-free surface;

[0044] Step 2, placing the aluminum alloy in an alkaline degreasing solution for 15 minutes. The alkaline degreasing solution includes 35 g / L of sodium hydroxide, and the temperature of the alkaline degreasing solution is 45° C.;

[0045] Step 3, washing the aluminum alloy in the neutralization solution for 2 minutes, the neutralization solution is a nitric acid solution with a mass percentage of 10%, and the temperature of the neutralization solution is 30° C.;

[0046] Step 4, place the aluminum alloy in an anodic o...

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Abstract

The invention relates to a method for coloring an anodic oxide layer of an aluminum alloy. The method comprises the following steps that firstly, the surface of the aluminum alloy is polished; secondly, the surface of the aluminum alloy is subjected to oil removal; thirdly, the surface of the aluminum alloy is cleaned with a neutralizing solution; fourthly, the aluminum alloy is placed in an anodic oxidation solution for anodic oxidation to form an anodic oxidation layer, the anodic oxidation comprises 0.5-2 g/L oxalic acid, 30-80 g/L chromic anhydride, 0.5-5 g/L boric acid, 0.5-1 g/L phosphoryl acetic acid and 0.1-0.5 g/L 3, 4-dihydroxyphenylacetic acid, the anodic oxidation temperature is 40-50 DEG C, the cathodic current density of anodic oxidation is 0.5-1A/dm < 2 >, and the anodic oxidation voltage is 25-40 V; 5, coloring the anodic oxide layer of the aluminum alloy by using a coloring solution; and step 6, carrying out hole sealing treatment on the colored anodic oxide layer.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to providing a method for coloring the anodic oxidation layer of an aluminum alloy. Background technique [0002] Aluminum alloy can form a layer of natural oxide layer on its surface under natural environment, but the amorphous film structure is loose, which cannot provide good corrosion resistance and cannot meet the requirements of use. The weather resistance and reliability of the oxide layer formed in the natural environment are very poor, so it is necessary to anodize the surface of the aluminum alloy to form a highly protective anodic oxide layer. In order to improve the decorativeness of the aluminum alloy, the aluminum alloy will be colored after the anodic oxidation treatment is completed. The traditional coloring method of the aluminum alloy adopts one-step electrolysis method or two-step electrolysis method, and the corresponding metal salt needs to be introduc...

Claims

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Application Information

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IPC IPC(8): C25D11/14C25D11/10C25D11/08C25D11/18C25D11/16
CPCC25D11/14C25D11/10C25D11/08C25D11/18C25D11/16
Inventor 曾文涛
Owner 惠州市安泰普表面处理科技有限公司
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